公开(公告)号：US20160154028A1

公开(公告)日：2016-06-02

申请号：US14947355

申请日：2015-11-20

Applicant: ABB S.p.A.

Inventor： Luca Ghezzi ,  Fabio Vallarino ,  Paolo Antonello

IPC: G01R15/18

CPC classification number: G01R15/183 ,  H01H83/226

Abstract: An electronic device (1) for measuring a differential current (ID) in an electric line (100) having a plurality of conductors, said electronic device comprising: a sensing circuit (2) comprising: a current transformer (21) having a magnetic core (211) through which the conductors of said electric line pass, a secondary winding (212) and an excitation winding (213) along which an excitation current (IE) circulates to polarize said magnetic core (211); an output circuit section (22) electrically connected to said secondary winding (212) and configured to provide a first signal (V1). The electronic device (1) further comprises: a first signal processing block (3) configured to process said first signal (V1) and provide a second signal (VD) indicative of said differential current (ID); a second signal processing block (4) configured to process said second signal (VD) and provide a first measurement signal (IDCM) indicative of the absolute value of a time-invariant component of said differential current (ID); a third signal processing block (5) configured to process said first signal (V1) and provide third and fourth signals (S1, S2) indicating whether said magnetic core (211) operates in a positive and/or in a negative saturation region of the hysteresis loop of said magnetic core; a fourth signal processing block (6) configured to process said third and fourth signals (S1, S2) and provide a second measurement signal (SDC) indicative of the direction of the time-invariant component of said differential current (ID).

Abstract translation: 一种用于测量具有多个导体的电线（100）中的差动电流（ID）的电子设备（1），所述电子设备包括：感测电路（2），包括：电流互感器（21），具有磁芯 （211），所述电线的导体穿过所述导体，次级绕组（212）和励磁绕组（213）沿着所述激励电流（IE）循环以使所述磁芯（211）极化; 电连接到所述次级绕组（212）并被配置为提供第一信号（V1）的输出电路部分（22）。 电子设备（1）还包括：第一信号处理块（3），被配置为处理所述第一信号（V1）并提供指示所述差分电流（ID）的第二信号（VD）; 第二信号处理块（4），被配置为处理所述第二信号（VD）并且提供指示所述差分电流（ID）的时间不变分量的绝对值的第一测量信号（IDCM）; 第三信号处理块（5），被配置为处理所述第一信号（V1）并提供指示所述磁芯（211）是否在所述第一信号（V1）的正和/或负饱和区域中工作的第三和第四信号（S1，S2） 所述磁芯的磁滞回线; 第四信号处理块（6），被配置为处理所述第三和第四信号（S1，S2），并提供指示所述差分电流（ID）的时间不变分量的方向的第二测量信号（SDC）。

公开(公告)号：US09651580B2

公开(公告)日：2017-05-16

申请号：US14947355

申请日：2015-11-20

Applicant: ABB S.p.A.

Inventor： Luca Ghezzi ,  Fabio Vallarino ,  Paolo Antonello

IPC: G01R15/18 ,  H01H83/22

CPC classification number: G01R15/183 ,  H01H83/226

Abstract: An electronic device (1) for measuring a differential current (ID) in an electric line (100) having a plurality of conductors, said electronic device comprising: a sensing circuit (2) comprising: a current transformer (21) having a magnetic core (211) through which the conductors of said electric line pass, a secondary winding (212) and an excitation winding (213) along which an excitation current (IE) circulates to polarize said magnetic core (211); an output circuit section (22) electrically connected to said secondary winding (212) and configured to provide a first signal (V1). The electronic device (1) further comprises: a first signal processing block (3) configured to process said first signal (V1) and provide a second signal (VD) indicative of said differential current (ID); a second signal processing block (4) configured to process said second signal (VD) and provide a first measurement signal (IDCM) indicative of the absolute value of a time-invariant component of said differential current (ID); a third signal processing block (5) configured to process said first signal (V1) and provide third and fourth signals (S1, S2) indicating whether said magnetic core (211) operates in a positive and/or in a negative saturation region of the hysteresis loop of said magnetic core; a fourth signal processing block (6) configured to process said third and fourth signals (S1, S2) and provide a second measurement signal (SDC) indicative of the direction of the time-invariant component of said differential current (ID).